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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51cc3d44c96b5d606f08029c46fc06a7e7b5f5f929b3547c592b8df6570b21ff' 
  AND token = '9uU1J0mk1D6W7CDP37ceEX8+IAPVhGR1qf0qVm9ejPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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