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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d3fb9dedd94b72f74030aabec2fcc29848b2c64dbddb241268abee1e0060645' 
  AND token = '86Y12gH97TgSkHb0/nE8jxvwyNpq2QOHpqAJkBYvNd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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