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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a423e71eb494ac5f9dccda8cae9f7f3f8ca3a477d84598ec0b63f53791424d' 
  AND token = 'R1TcOvQiBmEdyeckAA6WYj02t0t6isbF6KsAe5uUW6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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