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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd710f5264171a2a2c62ffbe606c97a4e2b5dcdf2521c4b00ae0ad9f6d745875e' 
  AND token = 'Ot2aF7m5hWyMY4FVEm+MSc11vD4E9z/xboj3yXCLlIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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