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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2cbdfb559c2b6baa73823dd097ffb2d41d7d964b062072214795f36bfa2f919' 
  AND token = 'rWAF+8unE674Sf4l5niKHcO9GwRWv62fsea6c04Klfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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