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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205fee2f68f38f8d3e017789848ed581577472a2bdfb68ab215e26dd9e3fb6f7' 
  AND token = 'SvU6KADi4eQE7smHZn+PGw/AQey1KwYQZY0+W64L8NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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