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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df23879f4e8c5808bbd8dc9225837b9614595cfe96baf03b9768ef09cc704544' 
  AND token = 'K11RvGf4CVaOhLtRMPb+wAMA1H8tXF0gbvIZO2s1Rb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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