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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb74a7cf48d3718397e1f493130f295dfd0e5cb678d349e3d3c99a112241e277' 
  AND token = 'AxUZ8jqWusFp/knEJepaYGBQHrQ2205mRoQIdrSjGhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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