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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b843869c48e28837c078171fad3702214788b8f234ab0afe83dd61193b9bb2e' 
  AND token = 'HyPbPlngLpO9pxU81Ew56gEHvbSgckh/Hy/TliG08l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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