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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b616b88977bdefd1774a8251d45d831e63c4ec9bec86c31c3e778ec5e29a0e2' 
  AND token = '1ZUnHKXGto2wwPSVKgFsKQyJfOHHtyKkbZ3H/7VtZYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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