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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bf689f439c411babfad292a41ae9e59267d790484948669ec61b7773249853' 
  AND token = 'kx5jgXv+UjJ+oPxHspNP8tNEA5Uiq35xPkROS20gFU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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