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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921603e84a79e6b57c2b8abd5dbca603000b1cd60bad5396b682a3740ccdb8d8' 
  AND token = '6f6vl8uWYvu/JIb1vHnluqv+SxWqyNF+/zGxX2RiB6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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