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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9be739742a6df097ef1560e7a645772e248295a494b0ed472d304a3880cd80' 
  AND token = '665IJHkFJjrMjHF4jXMI+sCwyS02FjxFv6QoClnSU9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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