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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c525f01f8c2693bf4ddaf4af854bd5d9abd88a7bdbb87761892065dc8c1f85a' 
  AND token = 'skrbpH2P0LXwBbFQ66E6zwCA7WU5aGWKNGh9XmmZXq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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