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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564494b120d398d2a8a52b46a0faa6e9f8a80abfac42effba1e6de9376c38038' 
  AND token = 'BZ4gkgZVXgXsU2dkjsnKIjA1wI3AFuY+OfjoLtA5LxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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