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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232a3177dea957d5f333531172f844df4ab27c8096e36f744f0620d620dc1868' 
  AND token = 'AlUZ8xwcNswCE7E0oIyEOdDRkKnZdm9KZdC+GGrvE70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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