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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c9c7ff88dc349ff8f52f2bbde6b431272602997677e621e96c87744ed82a59' 
  AND token = '4diKRzVH00oQzSzmle+XPiCHZVtOW1MWuSafqRrQ1bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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