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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c776dd4429c6fefd843d1045b0c0cadf40c8fdfa3adaf871c4e1a0e1d3a12532' 
  AND token = '2rGKfeZiYAa0dn67MjgJHH97B13+RHvXjW/JVjXZU0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}