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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040d93bc03185d5693d06e5abf0bcae330ea9dcdc138f87cb83a584058ef72e4' 
  AND token = '6eBGMxvePsb8FhInN+glK92Io033HhM+IcGqNhbJFXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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