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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd9d3dfacfc24c9c5eff0d8ff4d167d393392851dcff40d96b1047ec680eaad' 
  AND token = 'xn1rjqQzMtdA4rl9OmoZt8McMBrrSgPxKzwcZBV8JRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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