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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b07ffb43fbdbaea2c1b8207febb89eeeb0fc131cdc7ea83b14ea3f9046b114' 
  AND token = 'd2TrjnoZ9JFgsRhYYRM7wy6YS0XgoEbQ/e8zYl2HqVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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