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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d20a7ba352bc6b9915495cb4bd528c8568de7d436b1fbe9b66ad47e68d7cf5' 
  AND token = 'rXDEp8lYuCCcP86UDbO2KuF9ibPvibs2s/jrwbwDD5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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