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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59d7b0f6a7df234e6cf6368cee0a26f26129ce5f670cfbf4bbd4b2df5917c1b' 
  AND token = 'sFt2XARgJfgGVF94sx8VPEofry80Lo6U15sJ7pgziLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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