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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7732d5d778a2b66afc12b6d0bc03137c7ad44af09497a2ffa9a5a03fdd0bffdf' 
  AND token = 'M2joffTXQJYd2YtQGuoMJa3y6Pg19wSq2FS/Z2J5iiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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