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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d58dab761b75ad931dfda847b66fb7e5e06f254224fa254b28758ba6dbbbf3' 
  AND token = 'JhSn8lwlMT/BOFXQ/kFdiZX/T5TE6MNT1bkh9DEXnAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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