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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e25a65196accc77b8b8e155f86b90105cdf1f5ba0429dd487af8bccf68fbe89' 
  AND token = 'gMpEqGUnW59oTeLYrb1XxCBzozDs0HTFVffccTzpr6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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