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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ba2143fd8c4c25dd2dd6a3ebd5e26bf56e5788026f8a20eb781397edcd46fc' 
  AND token = 'NQpig6lPLsXMOI/41xMMM94qcs/xJmbbjukmGz4+9WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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