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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd3279180ad265c99ea16a6f833d3581743b2dad7415fa8b682b7fdb930a0b2' 
  AND token = 'mI1EobuxsbEZjBK1Q70bI7ALJzKzL5IHZzYn6w+n6Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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