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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa173a95b180069666fcee7d55a27aca15e0f417ff8e9b6c76f2f9c64a1da8d9' 
  AND token = 'E8uGTJyuYkYdeQaJjNLGgOyw5OF8COfTlQlR+9dLVV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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