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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df6de49e7f6b1514d99a1c3032f3f49baa745f037307e6dfee1847cb5793103' 
  AND token = 'c2S95JuyFYh4kMY+Xh+c/bhdu2jlId75pq8fyKmF9Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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