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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb60b14c87c143de7a5d1046557e5c68c14870ee16a4a90875391d2c25564b8' 
  AND token = 'Nt8gkks1WuUDbjstfucV0R0OZD+47dkewCoqdB3zPRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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