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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab63515aac2fa7eaf32dc0593ac784272ca2bafdc59e584fcc969b11d9fd4e89' 
  AND token = 'J76m9WS7jG3AxmhSgS+0VRIKbn99j57iWDpvQ3ddG7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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