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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a2d6527ec90679524be36a4cc14f86726603ef3e7143ae994de906f945521d' 
  AND token = 'vvz2Y4raf7HenJEUB8DUG0Tn5qrb4eM7vQ2GJ8lJhpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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