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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a23ef3be6547c3751aebe87ba3c7fe641667626336879ea902af1f1eff41b9e' 
  AND token = 'PUN4wFuFKcRbs2Ot84psM4HrXOzZ6hVOJuQXvsc5DiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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