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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b05b3dd926bba4f1649a64ee57f73c3391c2d0aed4d254900e6b492abf1a653' 
  AND token = '+GaTdOh+OIXLazOGUYqrDcG2bdfiQa7XG+adwL0JLJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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