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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93df47081eab304c8d43e781b00232416a49fcd1ae4eba349d7829fb1e8531ee' 
  AND token = 'PP8Lt3e76mp6xNXzhm9hm3h2SrfFbyyNF/x+EZjVrk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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