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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04328d38ef1910e6e3b036b952fadff0132e74b52b0a6fa40a80d35d2ecd67f6' 
  AND token = 'oAZ5+Df5m7W09A9ttZ6NcX9nI1ZEuvQFEafyN8U9vtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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