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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abb048014b5491aa19c8ab8c645c00b9d79cd929585a0a4791b6124e8e6a6bc' 
  AND token = '7GObRpnqlMOk7M2jL/Ek8WE9K4AqAySprsvKv3E7FDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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