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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1801528cb3d5d568b77d95057fab61bb4cfa2baa26fa3ee2a26d8765e2976cff' 
  AND token = 'FyPCizJ7he6pI+BlvdrWxLM63faBFkUVh72uhZ5TzAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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