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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf619fb02cdeeeedf7863f4d68f12453ecc449fd3ad7866c951a1beac94cf29' 
  AND token = 'OraWvNStz4fbkUQurs9K6sVzt4wSdnc3d/Mp9A0gOCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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