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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0ffae72a2aae38919213581cff1e768be13bcfa04a6e9e03e58052de28c8dc' 
  AND token = '5etvjOHloFWDI0kxmSUrD2Zg/0zVHlLP+tBd/472FXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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