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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc9430e66d2c8ca2ba4f7984be3153108d0dfa9d9d2ef0afb6c48fced5bfd35' 
  AND token = '3BT7QNAJBGnhUndoBT88auWGFvm9XMa7zreVcXooVVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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