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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db0765109561e29ed684d041fb0b59497eb1c85a36c5c349eed185df08a690e' 
  AND token = 'ko7BEfl65wESMeM8rGiE8IjXEFiBNY9JsKfPLc8PbRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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