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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6ee9b4ca7093a897266f80d955cdd76b0ac8d7c2d6bded4e3f00e27d919aae' 
  AND token = 'bA9IMehruaJ2O3nKZJMsNYXf+Jaa8GcjE6MfRyoovbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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