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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f306c20f7291226e4464581b9380afd9791174e6717193cb7abb6a6ae53f89' 
  AND token = '3FhIv3WsN0OeQoGIv63+ygCLbgfH8bgXqZJ8hJvZ1nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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