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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8723b114fb77497c0b1f44fa2201955aee63b9aefcb9fb2e6b3c961d2807d5b' 
  AND token = 'h3iySUIHhrocyLHMXhWzOuLoTlaxZnD8FmX4f9JDyvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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