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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d6a8c71e9e81845131a374301194aaa3ca91642217b20eb14c9c6e2cc5ffbb' 
  AND token = 'OV7UtJzOeCoN5kc95Kj8cssXBdXdn3oZ0APpG7qKeX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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