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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca8b516f7daf690bd540850fea92fff1e6b2e8ade2217bd8a0554c543a8ca80' 
  AND token = 'jDqzjuE1ALCXLcAGPxUa1g/2lOR54mKQIUxAo7J7qNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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