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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f2ae57ae31353ba25d8d996dabc1f1186657de309c8852e3a9106afc0b3e4e' 
  AND token = 'tyTieFL0jBwtLRtj1Wc/7U9j0nOt/b2YHZohTH0i/lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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