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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd348817a7a3a76ca9c2e4d9930ff766e2f93c27dbcd9b3d9cbcfde459c802b15' 
  AND token = 'bHpRK3aBw+dMHnMhA1z4EgIWf6wrvcnbRn/tr6GTwu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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