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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a86e22bf1f17de15df9c1c3171b59ef842eec77a30cee27919e2055722234c8' 
  AND token = 'IbaHFeCTKJT+R52cGp5bCjsu3JgTUBiEKDCyuZnIe2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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