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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14848bec655ca5a2b8a48e7f334b0d16b878bbc478b65eed77339416719a9d51' 
  AND token = 'WhSOoH0F0PtBOe62z9u5ySVdKFtIOnrkKirQD3g7Bps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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