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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3d6b0f8220c4e45be117f7b0bd7af8d1fd3f8c58f80dc4d9493cf82561c117' 
  AND token = 'EA9vMVc3IKYAMNZ/ik4RxpwWzgbpvycyKn6LwG3LCwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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