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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39074121f9f1fc34654e14b78bb906cd002a896fb6479a71ad4f8bccb179b98a' 
  AND token = 'aIiP7qaj/USVkeoXBLPGuXyJpz7jTd8NvbkLp2SdV0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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