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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9ea10e4835130a4976a5676ce1e2cfa76bb3f523b0aa3bcf18b213137aa2cb' 
  AND token = 'a5Sua4jbcRWH/HJwjAnLBaGnHnDzGww7mYnhJX2m0oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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