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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccfe98e8831f709fe7c75183dd1b8f90ef6a2988563cf8d6c8dc25d40bf90f9' 
  AND token = 'IbLjz1lotO3qUt9wcQzSNvOkA8LHXE3yd65rzzmH/OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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