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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20222abdd4f284bca4b28264139a7c90efa963398b1ae7c9a3b83eed68eb63c' 
  AND token = '/6pe3Y6GfnjYHtWj1nNueKWFcotFa0VrAIj6p8vOlQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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