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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e81e49936aad557aaf4d0b06f8f94501d16604d4e452ba47aed22b91f17bc3b' 
  AND token = '/a5mluwUjmLSDPffQV4MdBqW1PJ0ciufmddbiq2rb60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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