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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85206e4623b53b079f03e3c1438f5d3f2dbffd307bb5589231e6a90beb9a2de' 
  AND token = '3VeEELDDG//PHXzuosvbRj1Aa8ZmKtr9OsALTXU+QOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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