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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a1a05797086101ca89bd918ac72d62836a3461925e409a6bd9db97db9ed4ea' 
  AND token = 'Se6sq8RXZ0NfzMJ4AY1TltUS3zeQTtsi/TZpixx8+Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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