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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eddb273962de799a0f8f1f1978d18f936dba9a72860b746ef05bf30f55bb6d02' 
  AND token = 'MILL+ksnoBIrFKcKnSuq1EXUeh/QU/o6L9/D/cdUBTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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