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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271481dd521c0a0b56833034b8d55dcb013486ed16cb898ceb2f9969403bdc63' 
  AND token = 'RJSe6+TBplLg6tW7J3tAvDC2omlV9K9hlSfvf4U+k08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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