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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92413871d777c46362b146768539a32a7fb749c8aa25d93727936f80f7a311f5' 
  AND token = 'sW4z/ZnFMJApfsorH/MCksvsTud6cv13zbAl8DsevfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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