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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563c80bb7693fe18dca80ac3bca43bfec3383cd0a424dbcfebd4c67f6cf9d310' 
  AND token = 'SeuoZvd4WJKi6aSeqIUaOP+i8dXojc1fTBahY2l/qmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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