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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959a8cee2a9dbd0628f626912f25855a2e1df8e33ced43430319eec62ada9674' 
  AND token = 'uqgOVTh7T1xDMlvCV0Qh0hHcqdJsVHneffKrfTyg4Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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