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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ba3104d6689d5eb2ba45a47166a77b91c79ba43213fcdad43f70fe48a86f15' 
  AND token = 'dxA98+6t1jjr5HCBLuQa2+BnSIvOJCSSRsUsfaWe2Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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