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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb740392bbf89de67675fd1b6f0268cb3730b13bc5e61113aa71b0efb497498' 
  AND token = '21q+d8ERoOhRtEIfSM3X0AkooY5DobHlaBGbWaUbh44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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