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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba2d8069ccad812696410a6d8ef1b5c5a529d8e2d6c94ede454c1015e865398' 
  AND token = 'Zi2jNVHL17wtk+diyMQu9IEPSqYIr+5F/BIKbjvPENQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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