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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc3c093cda2cbb02d80a18e0da00d87df8302a19de1e2bba6c6857ceb6ec6bc' 
  AND token = '9dmziGGKgUq8/YtcRmkz0waC/KsrYsI5Lk6eWFYKuxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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