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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baaf58f2d59c9d1bca9ea743cadddb6d76cfdcb3900b31564caf085795d534f0' 
  AND token = 'eM8NjoeFJnVYKVLvkdP6wc5/tHaaa9itZuGa1u+pNaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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